Method for preparing polymer gel electrolyte cell

A gel electrolyte and polymer technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problem of low gel electrolyte production efficiency, poor rate performance and cycle performance, and low initial capacity/efficiency of cells and other problems, to achieve the effect of good comprehensive electrochemical performance, good rate discharge performance and excellent safety performance.

Active Publication Date: 2013-06-26
DONGGUAN AMPEREX TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] 2. In-situ gel method: This method is generally to mix polymerizable small molecule monomers, initiators, crosslinking agents, coupling agents, etc. with liquid electrolyte, and then generate (free radicals, cations, etc.) Polymerization reaction forms gel in situ, which has the advantages of simple process, low cost, and high conductivity when the polymer skeleton content is low. However, the system formed by this method has a dense and non-porous structure, so that the rate performance and The cycle performance is poor, and the monomer is not easy to polymerize completely, and the residual monomer and initiator fragments will have a negative impact on the electrochemical stability of the cell.
However, the viscosity of the pre-gel solution of this invention is 300-2500CP, which is hundreds to thousands of times that of conventional liquid electrolytes, thus bringing about the problem of difficulty in wetting pole pieces and separators, although the inventor also realized that the viscosity The molecular weight is limited to less than 10,000 due to the problem of poor wetting, but even if a low molecular weight polymer is used, or the method of reducing the amount of polymer added is used, the battery cells prepared by the invention still have low initial capacity / efficiency and low cycle time. Disadvantages of rapid capacity decay
The Chinese invention patent application 201210128618.7 provides a large-area electrospinning gel realization process. The gel electrolyte membrane prepared by this method has the advantages of large porosity, high conductivity, and good comprehensive performance. However, the electrostatic Spinning is easy to catch fire in a high-pressure drying environment, and a relatively sealed environment is required to control dust, and it is difficult to recover the solvent after volatilization, which is easy to cause air pollution. In addition, the cost of electrospinning is high, so the production efficiency of gel electrolyte is low. large scale industrial production

Method used

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  • Method for preparing polymer gel electrolyte cell
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  • Method for preparing polymer gel electrolyte cell

Examples

Experimental program
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Embodiment 1

[0030] Preparation of polymer suspension dispersion: in the glove box, the weight percent was 11% LiPF 6 and 1% LiB(C 2 o 4 ) 2 Add the mixed solvent EC:PC:DEC:VC:FEC to 28.7%:28.7%:24.6%:1%:2%, stir and dissolve at room temperature (25°C), cool to room temperature for later use; high-speed ball mill the pre-dispersed 1 The PMMA of % weight and the weight PVDF of 2% are added in the above-mentioned solution, after high-speed stirring 10min, seal with Para-film and take out from glove box, put into SK8200HP ultrasonic cleaner (Shanghai Kedao production, maximum ultrasonic power 500W, In the working frequency 53KHz), the temperature of the water bath is controlled between 45-50°C, and ultrasonic is used for 15 minutes to obtain a colorless and transparent polymer suspension dispersion with a viscosity not exceeding 5.0CP, which is sealed and placed in a glove box for use.

[0031] Preparation of lithium-ion batteries: 2865B3 square empty batteries packaged in aluminum and pla...

Embodiment 2-9

[0033] Examples 2-9: See Table 1 for the types and amounts of polymers added in each example, and see Table 2 for process parameters.

[0034] Table 1, the electrolyte formula table (%) of each embodiment and comparative example

[0035]

[0036] Table 2, the technological parameter table of each embodiment and comparative example

[0037]

[0038] Carefully disassemble the cells of Examples 1-9 in a dry room with a relative humidity of less than 0.5%, and find that there is no free liquid electrolyte at the anode / diaphragm / cathode interface, the edge of the bare cell, and the inner surface of the aluminum-plastic packaging bag Both can be found light yellow transparent gel, the gel is slightly viscous, and no liquid electrolyte is released when pressed by fingers.

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Abstract

The invention discloses a method for preparing a polymer gel electrolyte cell. The method comprises the following steps of: (1) polymer powder pretreatment: performing high-speed ball-milling on a polymer powder body, and thus obtaining powder with the granularity less than 1 mu m; (2) polymer powder dispersion: mixing the polymer powder which is obtained by ball-milling in the step (1) with a non-aqueous solvent, lithium salt and an additive to prepare sub-micron-sized polymer suspended dispersion liquid; and (3) electrolyte gelatinization: injecting the polymer suspended dispersion liquid which is prepared in the step (2) into a lithium ion cell for full immersion, gelatinizing at high temperature for 1 to 12 hours, and cooling to obtain the polymer gel electrolyte cell. Compared with the prior art, the polymer gel electrolyte cell prepared by using the method is high in ionic conductivity, low in battery internal resistance, long in cycle life, high in high-temperature performance, high in safety performance and free from liquid leakage risk. The polymer gel electrolyte cell is obviously superior to an electrolyte cell prepared by using a conventional preparation method in terms of comprehensive performance.

Description

technical field [0001] The invention belongs to the field of polymer lithium ion batteries, and more specifically, the invention relates to a preparation method of a polymer gel electrolyte cell. Background technique [0002] Compared with lead-acid, Ni-Cd, and MH-Ni batteries, lithium-ion batteries have higher specific volume energy density, specific gravimetric energy density, and better environmental friendliness, so they have been widely used in mobile phones, portable audio and video players , laptops, handheld touch screen tablets and other electronic products. In recent years, as the concept of energy crisis has been deeply rooted in the hearts of the people, people have gradually realized that excessive reliance on fossil energy is extremely dangerous, thus setting off a worldwide EV-HEV (electric vehicle, hybrid electric vehicle), as well as intermittent power generation such as wind power and photovoltaic power generation. The energy storage station (ESS) boom of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0565
CPCY02E60/10Y02P70/50
Inventor 江辉游从辉俢倩
Owner DONGGUAN AMPEREX TECH
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